Frostet ice, which is created with "frost walker" does not disappear when it was produced under water.
MC-90574
frosted ice will not disappear under water
Resolved
Works As Intended
0
The bug requires the player to be fully submerged for this bug to occur. If you create frost 1 block under the surface of the water, it vanishes normally. If you create frost 2 or more blocks under the surface of the water, it never vanishes.
EDIT: further testing reveals that this is a light level issue. Placing glowstone underwater near the frost blocks causes them to begin breaking. This would also include frost not breaking at night.